Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses
 
PerlMonks  

Re^2: Dynamic regex assertions, capturing groups, and parsers: joy and terror

by diotalevi (Canon)
on Oct 03, 2005 at 23:09 UTC ( #497077=note: print w/replies, xml ) Need Help??


in reply to Re: Dynamic regex assertions, capturing groups, and parsers: joy and terror
in thread Dynamic regex assertions, capturing groups, and parsers: joy and terror

The result of (??{ print $1 }) is 1 because print() succeeded in writing to STDOUT. The regex that was then compiled by (??{ ...}) was "1" which then failed. So the (.) advanced over every character and printed them individually. The proper thing to do here would have been (?{ ... }) which will not affect regex matching.

  • Comment on Re^2: Dynamic regex assertions, capturing groups, and parsers: joy and terror

Replies are listed 'Best First'.
Re^3: Dynamic regex assertions, capturing groups, and parsers: joy and terror
by demerphq (Chancellor) on Oct 04, 2005 at 09:13 UTC

    Doh. Of course. I knew that the print returning 1 failed the match, but i didn't put two and two together to realize that was why all of the chars were printed. And I've used this technique deliberately before too. /gah.

    Thanks for the clue-by-four. :-)

    ---
    $world=~s/war/peace/g

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://497077]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (5)
As of 2020-05-30 10:31 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    If programming languages were movie genres, Perl would be:















    Results (171 votes). Check out past polls.

    Notices?